Soot and creosote eliminator



March 2, 1937.

P. J. LIBBY 2,072,758

SOOT AND CREOSOTE ELIMINATOR Filed NOV. 13, 1934 gwutwvliom 7 g/ I- JIL i669 Patented Mar. 2, 1937 Ui'l'ED S'E'TE.

A'E'ENT OFFlQE 1 Claim.

This invention relates to furnace constructions and more particularly to a means adapted to be inserted in a chimney to eliminate the accumulation of soot and creosote.

An object of this invention is to provide an eliminating means of the character set forth which can be readily mounted in the present chimney constructions so that a constant draft will be maintained through the chimney without impairing the draft in the furnace or stove.

Another object of this invention is to provide a device of this kind which will not only eliminate the accumulation of soot and creosote but will also prevent the pocketing or accumulation of unburned gases in the chimney which thereby cause backfiring or explosions in the chimney.

A further object of this invention is to provide a device of this kind which will operate to constantly withdraw air out of the furnace room or 0 cellar so that the air in the cellar will be kept clean by reason of the removal of the gas filled air through the chimney.

The above and various other objects and advantages of this invention will in part be described and in part be understood from the following detailed description of the present preferred embodiment, the same being illustrated in the accompanying drawing wherein:

Figure 1 is a vertical section of a flue or chimney having a furnace connected thereto and having a device constructed according to the preferred embodiment of this invention.

Figure 2 is a perspective view partly cut away and in section of the draft controlling means.

Figure 3 is a vertical section taken substantially through the center of the device.

Referring to the drawing wherein like numerals of reference designate corresponding parts throughout the views, the numeral l0 designates 0 generally a casing comprising a cylindrical body I l provided with a flanged inner end I2 having a plurality of openings or ports i3 therethrough.

The outer end of the casing It is closed by means of a plate It provided with a plurality of open- 5 ings l5 and this plate 14 is extended beyond the periphery of the casing i I so as to provide a marginal flange It.

An inner baflle member, generally designated as I1, is disposed in spaced relation to the inner end I2 and this bafiie member ll comprises a relatively rigid metal plate l8 having a plate or disk l9 contacting with the outer face thereof and which disk I9 is preferably constructed of asbestos or other fire-proof material.

A second or outer baflle is disposed in outwardly spaced relation to the inner baflie I1 and comprises a disk or plate 2! preferably of metal and a disk or plate 22 preferably of asbestos which contacts with the outer face of the metal plate 2 i. The two baflies ii and 20 have their outer marginal portions disposed in spaced relation to the inner surface of the casing H so that air may freely pass thereabout. The two baffles H and 2!) are held in spaced relation to each other by means of a substantially U-shaped spacing member 23, and a second U-shaped spacing member 24 engages the outer baflle 2D and holds this bafile 20 in spaced relation to the outer wall Hi.

A bolt 25 extends concentrically through the casing l l and through the baflies ll and 20 together with the spacing members 23 and 2 3 and preferably the head 26 of the bolt 25 engages on the outside of the outer wall It, and a nut 21 is threaded onto the bolt 25 and disposed inwardly of the inner wall I 2 and holds the baffles I? and 2G in assembled relation. A wing nut 28 is threaded onto the inner end of the bolt 25 and a washer 29 is interposed between, the wing nut 28 and the inner end member I2.

In the use of this device, the hollow body or casing H), as will be noted from the drawing, is inserted in a chimney C at a point below the entrance of the smoke pipe P in the chimney. In chimney constructions, it is common for the soot and creosote to accumulate inthe lower portion or chamber below the entrance of the smoke pipe P into the chimney in view of the fact that no air enters the lower portion of the chimney. When the furnace is in full draft, the soot or creosote will not ordinarily accumulate in the chimney C due to the substantially perfect combustion, but where the drafts of the furnace are shut down and the furnace checked, there is an imperfect combustion in the furnace and in the pipe P, and the unburned gases then pass into the chimney C where there is formed a down draft which, upon striking the unburned gases, causes condensation and precipitation. This precipitation accumulates in the chimney C and after aperiod of time, the creosote accumulated in the chimney will seep through the bricks and not only cause damage to the walls and paper on the walls, but this accumulation of creosote upon restarting of the furnace has a tendency to catch fire. However, through the use of the structure hereinbefore described, the dry air normally in the cellar will enter the intake ports 15 and pass about the baflles 20 and [1, respectively, and then enter the chimney C through the outlet ports IS. The use of the bafiies l1 and 20 will have a tendency to retard the flow of air so that while a quantity of air is permitted to enter the lower portion of the chimney, this quantity of air will not be sufiicient to cut down the suction through the furnace but will in eifect act to improve the suction through the furnace. It will be apparent from the foregoing that with the use of this device, a draft of dry air will be formed in the chimney at all times irrespective of whether the furnace connected to the smoke pipe P is open or shut down.

The device hereinbefore described is preferably positioned within the chimney or flue C at a point closely adjacent the point where the smoke pipe P discharges into the chimney. It is for this reason that there are provided a pair of baflles disposed in spaced relation to each other and to the inner and outer walls of the device so that the innermost bafile Will receive the greatest quantity of heat and the outer bafile will be engaged by the incoming air which will maintain it in a cool state. Furthermore, by using two bafiies a constant stream of cool air is permitted to pass through the device and due to the position of the device, with respect to the smoke pipe, a draft of cool air will strike the hot gases or heated air discharged into the chimney by the smoke pipe. In this manner no hot air or gases will be permitted to flow down into the space below the smoke pipe P and thus no trap will be formed within the chimney.

What is claimed is:--

A soot eliminator as set forth, comprising a cylindrical casing adapted to be inserted in a chimney opening, a perforated cap on one end of the casing, a perforate plate on the other end of the casing, a pair of spaced apart baffles disposed within the casing and having a diameter less than the diameter of the casing whereby to permit air to pass about the marginal edges thereof, a bolt extending axially of the casing through the cap and the plate for supporting the baffles within the casing and holding the parts in assembled relation, a pair of U-shaped spacing members carried by the bolt for holding the baffles in spaced apart relation and a fibrous fireproof member engaging against a face of each plate.

PAUL J. LIBBY. 

